So in last week’s Saturday Sondheim: I looked at the idea of knowing things, and what the cost of that is for the characters who learn things but pretty much always have to deal with the ambivalence that leads to. This week – I want to go slightly further into the nerdy academic looking glass of how Sondheim sometimes messes with time. If you thought you were not going to get a Doctor Who reference here then I’m sorry, I’m so so sorry.